When Diluc was just five years old it was announced to him that he would be getting a younger sibling, which was you! And after what was a long nine months in his eyes you were born!

Now five long years have passed and you're now the age he was when you were born and now he's at ten years old, there was recently a large celebration for him as he had gotten a Pyro vision, even though you weren't old enough to understand what that was you still celebrated with him.

Ever since that day he had been away a lot more and helping around the winery a lot more often and you'd always follow him around while working but as long as you didn't get in the way it was fine in his eyes.

One day You, Diluc and your father were all inside the winery, you and Diluc were 'playing' chess one one side of the table (you were playing about with all the pieces as if they were dolls) and your father, Crepus sat on the other side watching, drinking a cup of tea